[This note covers all of the Caveat Files for Part III.]
There are fourteen caveat files for the period 1887-1896, with Edison case numbers 110-123. They are arranged in case-number order. In addition, there are eight caveat drafts without case numbers covering the period 1887-1890, which appear in chronological order following the numbered files. For most of the numbered caveats, there are draft notes and drawings in Edison's hand and a typed copy, which was retained by attorney Richard N. Dyer. Since there are often substantive differences between the two versions, both have been included. However, the blueprint drawings retained by Dyer have not been selected except for those accompanying the three caveats lacking a draft by Edison.
The caveats in the Patent Series bear a close relationship to the notes and drawings in the Notebook Series, many of which carry inscriptions indicating that they were used in the preparation of caveats or patent applications.
[PT031AAB], Patent Caveat, Thomas Alva Edison, October 15th, 1888 1888-10-15
[PT031AAB1], Technical Note, Thomas Alva Edison, September 21st, 1888 1888-09-21